Setting The Port Shutdown Mode - 3Com 4500G Family Configuration Manual

To do...
Enter system view
Set the DelayDown timer
DelayDown timer setting applies to all DLDP-enabled ports.

Setting the Port Shutdown Mode

On detecting a unidirectional link, the ports can be shut down in one of the following two modes.
Manual mode. This mode applies to low performance networks, where normal links may be treated
as unidirectional links. It protects data traffic transmission against false unidirectional links. In this
mode, DLDP only detects unidirectional links and the DLDP state machine generates log and traps
to prompt you to manually shut down unidirectional link ports with the shutdown command. The
DLDP state machine transits to the Disable state only after you manually shut down unidirectional
link ports with the shutdown command.
Auto mode. In this mode, when a unidirectional link is detected, DLDP transits to Disable state,
generates log and traps, and sets the port state to DLDP Down.
Follow these steps to set port shutdown mode:
To do...
Enter system view
Set port shutdown mode
On a port with both remote OAM loopback and DLDP enabled, if the port shutdown mode is auto
mode, the port will be shut down by DLDP when it receives a packet sent by itself, causing remote
OAM loopback to operate improperly. To prevent this, you need to set the port shutdown mode to
auto.
If the device is busy, or the CPU usage is high, normal links may be treated as unidirectional links.
In this case, you can set the port shutdown mode to manual mode to alleviate the impact caused by
false unidirectional link report.
Use the command...
system-view
dldp delaydown-timer time
Use the command...
system-view
dldp unidirectional-shutdown
{ auto | manual }
1-11
Remarks
—
Optional
1 second by default
Remarks
—
Optional
auto by default